Dec 11, 2021

A new super-cooled microwave source boosts the scale-up of quantum computers

Posted by in categories: computing, quantum physics

Researchers in Finland have developed a circuit that produces the high-quality microwave signals required to control quantum computers while operating at temperatures near absolute zero. This is a key step towards moving the control system closer to the quantum processor, which may make it possible to greatly increase the number of qubits in the processor.

One of the factors limiting the size of quantum computers is the mechanism used to control the qubits in quantum processors. This is normally accomplished using a series of pulses, and because quantum processors operate at temperatures near absolute zero, the control pulses are normally brought into the cooled environment via broadband cables from room temperature.

As the number of qubits grows, so does the number of cables needed. This limits the potential size of a quantum , because the refrigerators cooling the qubits would have to become larger to accommodate more and more cables while also working harder to cool them down—ultimately a losing proposition.

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